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  <title>需求</title>

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  <h2 class="title">需求</h2>
  <p class="para">
   These functions work using <a href="http://mcrypt.sourceforge.net/" class="link external">&raquo;&nbsp;mcrypt</a>.
   To use it, download <var class="filename">libmcrypt-x.x.tar.gz</var> from <a href="http://mcrypt.sourceforge.net/" class="link external">&raquo;&nbsp;http://mcrypt.sourceforge.net/</a> and follow the included
   installation instructions.
  </p>
  <p class="simpara">
   As of PHP 5.0.0 you will need libmcrypt Version 2.5.6 or greater.
  </p>
  <p class="para">
   Windows users will find the library is the PHP 5.2 Windows binaries release.
   PHP 5.3 Windows binaries uses the static version of the MCrypt library, no
   DLL are needed.
  </p>
  <p class="para">
   If you linked against libmcrypt 2.4.x or higher, the following additional
   block algorithms are supported: CAST, LOKI97, RIJNDAEL, SAFERPLUS,
   SERPENT and the following stream ciphers: ENIGMA (crypt), PANAMA, RC4 and
   WAKE. With libmcrypt 2.4.x or higher another cipher mode is also
   available; nOFB.
  </p>
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